Hi, I have 3CX System 12 SP6 installed. System works fine. I have remote phone connecting via public IP, I have Android phones registering via public IP. Since 5 days ago ONLY Iphone devices cannot register 3CXPhone for 3CX Phone System 12 App. I cannot even see attempts to hit the firewall on Public IP. I have uninstalled and re-install Iphone app with no success. I can register older version of 3CXPhone for 3CX Phone System on same iPhone with same settings. IOS app is connecting without the tunnel, via Public IP. Everything is pointing to a bug in V12 IOS app, where it doesn't even try to register to external IP address.